US3253879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chrome-syntan pretannage followed by dry chrome tannage
Assignee: Bayer AG
•
Filing: 1962-07-03
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Granted: 1966-05-31
•
Expires: 1982-07-03
Abstract
No abstract record available.
Inventors
- 👤 Komarek Ernst
- 👤 Mauthe Gustav
- 👤 Zinz Bruno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
PROCESS FOR THE RAPID TANNING OF MEDIUM AND HEAVY LEATHERS CONSISTING ESSENTIALLY OF (A) PRETANNING DELIMED HIDES WITH A NORAML OR BASIC TANNING CHROMIUM SALT AND A SYNTAN OBTAINED BY THE CONDENSATION OF A PHENOL WITH AN ALIPHATIC ALDEHYDE AND WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF A SULFITE AND A BISULFITE, AND (B) FINALLY TANNING BY DRUMMING THE HIDE WITH AN EFFECTIVE AMOUNT OF A POWDERED VEGETABLE TANNING EXTRACT ONLY.
Claim 2
Dependent Claim
73 words
PROCESS FOR THE RAPID TANNING OF MEDIUM AND HEAVY LEATHERS CONSISTING ESSENTIALLY OF (A) PRETANNING DELIMED HIDES WITH A NORAML OR BASIC TANNING CHROMIUM SALT AND A SYNTAN OBTAINED BY THE CONDENSATION OF A PHENOL WITH AN ALIPHATIC ALDEHYDE AND WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF A SULFITE AND A BISULFITE, AND (B) FINALLY TANNING BY DRUMMING THE HIDE WITH AN EFFECTIVE AMOUNT OF A POWDERED VEGETABLE TANNING EXTRACT ONLY.
References Cited (Backward Citations)
GB310823A
Cited
DE611671C
Cited
DE858561C
Cited
US2955904A
Cited
US2997364A
Cited
DE1053517B
Cited
US3010779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |